# Eligible messages and streams
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Elemental Live can extract SCTE-35 messages and SCTE-104 messages from input sources. 

The following table specifies the sources (and their corresponding input types) that Elemental Live supports for each message type.



- **Message type**
  - Source type
  - Elemental Live Input type

- **SCTE-35**
  - HLS / HLS network input
  - MPTS over RTP or UDP / Network input
  - Transport stream / Secure Reliable Transport (SRT) 
  - Transport stream over RTP or UDP / Network input 
  - Transport stream over RTP with SMPTE 2022-7 redundancy / SMPTE 2022-7 network input 

- **SCTE-104**
  - SDI / An SDI or Quadrant interface
  - SDI / Interleave 4K (HD-2SI) 
  - SMPTE 2110-04 over RTP or UDP / SMPTE 2110



**Note**  
SCTE-104 messages are converted to SCTE-35 messages early in the processing, so this guide uses “SCTE-35 messages” to refer to both SCTE-35 messages and SCTE-104 messages.